LatinIME/src/com/android/inputmethod/latin/CandidateViewContainer.java

84 lines
2.8 KiB
Java

/*
* Copyright (C) 2008-2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.android.inputmethod.latin;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.LinearLayout;
public class CandidateViewContainer extends LinearLayout implements OnTouchListener {
private View mButtonLeft;
private View mButtonRight;
private View mButtonLeftLayout;
private View mButtonRightLayout;
private CandidateView mCandidates;
public CandidateViewContainer(Context screen, AttributeSet attrs) {
super(screen, attrs);
}
public void initViews() {
if (mCandidates == null) {
mButtonLeftLayout = findViewById(R.id.candidate_left_parent);
mButtonLeft = findViewById(R.id.candidate_left);
if (mButtonLeft != null) {
mButtonLeft.setOnTouchListener(this);
}
mButtonRightLayout = findViewById(R.id.candidate_right_parent);
mButtonRight = findViewById(R.id.candidate_right);
if (mButtonRight != null) {
mButtonRight.setOnTouchListener(this);
}
mCandidates = (CandidateView) findViewById(R.id.candidates);
}
}
@Override
public void requestLayout() {
if (mCandidates != null) {
int availableWidth = mCandidates.getWidth();
int neededWidth = mCandidates.computeHorizontalScrollRange();
int x = mCandidates.getScrollX();
boolean leftVisible = x > 0;
boolean rightVisible = x + availableWidth < neededWidth;
if (mButtonLeftLayout != null) {
mButtonLeftLayout.setVisibility(leftVisible ? VISIBLE : GONE);
}
if (mButtonRightLayout != null) {
mButtonRightLayout.setVisibility(rightVisible ? VISIBLE : GONE);
}
}
super.requestLayout();
}
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
if (v == mButtonRight) {
mCandidates.scrollNext();
} else if (v == mButtonLeft) {
mCandidates.scrollPrev();
}
}
return false;
}
}